K&N Universal Round Tapered Filter Wrap - Black - 6in Base ID x 4.625in Top ID x 9in HeightThe K&N PreCharger filter wrap is specially designed to extend the service interval of your K&N Filtercharger filter when used in very dusty conditions. They are made from durable polyester material containing a uniform weave. The PreCharger will stop small dirt particles with minimal restriction to the airflow of the filter.